Hot-air furnace.



L. HOWARD. HOT AIR FURNACE. APPLICATION Hum AUG. 29, 190a.

Patented Mar. 29, 1910.

2 SHEETS-SHEET 1.

A p 1 p l \1 M 'IHM Hi 1 g 1W W M M W J @7) f\\ 11 K v :X V1

g gg ak wfiw L. HOWARD.

HOT AIR FURNACE.

APPLIOATI'ON IILED AUG. 29, 190a.

953,465, Patented Mar.29, 1910. v I 2 SHEETS-SHEET 2.

IN VBN TOR a. z. z W

A TTORNE Y ANDREW k GRAHAM co.. PHOTO-LITHOGRAPHERS. WASMINGYON. n c.

T FFTQ.

LINCOLN HOWARD, OF SAVANNAH, MISSOURI.

HOT-AIR FURNACE.

To all whom it may concern:

Be it known that I, LINooLN HOWARD, a citizen of the United States,residing at Savannah, in the county of Andrew and State of Missouri,have invented certain new and useful Improvements in a Hot-Air Furnace,of which the following is a specification.

The object of my invention is to provide a hot air furnace that byreason of its construction will both intensify the heat and economizefuel.

I accomplish my object by the mechanism illustrated in the accompanyingdrawings, in which Figure 1 is a sectional elevation of the furnace, thefire pot broken away, showing the interior thereof; Fig. 2 is a plan ofthe ash pit casting showing the draft opening; Fig. 8 is a plan of thelower fire pot casting, also showing draft opening; Fig. 4 is a plan ofthe upper fire potcasting showing draft ports in the same; Fig. 5 is aplan view of the corrugated heat radiating device, arrows indicatingcourse of the smoke and heat gases; Fig. 6 is a cross section of thefire pot and outer band as seen on line mm in Fig. 1, and Fig. 7 is across section of the fire pot and a lower outer rear wall on line y inFig. 1.

Similar letters refer to similar parts in the several views.

A is an outer jacket around the furnace.

B is the base which forms an ash pit B and supports the fire pot,combustion chamber walls, cap and radiator of the device.

0 is a lower section of the fire pot and C an upper section of said firepot. Said sections are respectively provided with flanges o and c. Thetop inner edge of flange c is provided with a groove 0 to receive theupper Section of the fire pot, thus making a complete fire pot. The topof the outer edge of said flange is provided with a similar groove 0 inwhich a curved band D fits, forming a space D around said upper sectionof the fire pot. The outer edge of flange 0 is rovided with a lowergroove 0 to receive the upper edge of band D, and with an upper groove 0to receive that see- Specification of Letters Patent.

Application filed. August 29, 1908.

Patented Mar. 29, 1910.

Serial No. 450,841.

' tion of the combustion chamber wall H to which is fastened, or cast,the diaphragm check draft M.

h is a supporting groove cast on section H of the combustion chamber.

I is an upper section of the combustion chamber wall.

I is a deep cap to the upper section of the wall of the combustionchamber, as shown in Fig. 5, and is cast as a part of the radiator J; italso serves as a cavity, or passage, through which heat produced by theburning of gas and smoke passes from the combustion chamber to saidradiator.

K is a draft door and K is a draft tube formed by a part of band D. Thedraft admitted through the draft door K and draft tube K passes throughsaid space D and becomes highly heated in passing to the rear of thefire pot, the larger part passing thence through a plurality of ports LL in the back part of the flange o of the fire pot into the combustionchamber under the dia phragm check draft M where it is forced to minglewith and burn the gases and smoke coked out of the fuel, while thesmaller part passes down through a semi-circular opening N, as shown inFig. 3, in the flange at the back part of the section 0 of the fire pot;thence down through a similar opening N, as shown in Fig. 2, in the rearof base B; thence up through the grate Z) to start and keep up thecoking and gas making process.

0 is a curved iron band, as shown in Fig. 7, joining the flange ofsection C of fire pot to base B forming a passage for so much of thedraft as goes down through the semicircular openings N and N. The innerwall of said radiator is perfectly smooth while the outer wall iscorrugated, as shown in Fig. 5, for the dual purpose of causing the heatto rebound from side to side and to increase the radiating surface.

The air heated in draft tube K passes from the tube into the spacearound the fire pot. Here its temperature continues to increase; it isthen ready to be admitted to the fire and enters the combustion chamberat the rear through openings L L in the flange in the back part in theupper section of the fire pot. The volume of air thus admitted has beengreatly expanded by its rise in temperature and rushes into the largecombustion chamber with great force. By means of the diaphragm checkdraft this preheated air is deflected toward the fire and forced tomingle with the combustible smoke and gases arising from the fuel. Theamount of draft passing downward is only suflicient to keep the firealive and keep up the coking and gas making process.

I reserve the right to make the radiator in one or two pieces, and fromeither cast iron or steel and to make any alterations in my device thatare merely mechanical.

What I claim and desire to secure by Letters Patent, is

1. The combination in a hot air furnace, of a base provided with asemi-circular opening at the rear, a lower section of fire pot supportedon said base and an outwardly projected flange thereon provided with asemi-circular opening therein and inner and outer grooves on the topthereof, an upper section of fire pot seated in said inner groove and anoutwardly projected flange thereon provided with a plurality of portstherein and upper and lower grooves at the outer edge thereof, an outercurved band spaced from said upper section of the fire pot, a lowercurved iron band spaced from said lower section of the fire pot saidupper band being seated in the groove in the outer edge of the flange onthe lower section of the fire pot and the groove underneath the outeredge of the flange on the upper section of the fire pot, said lowercurved band joining the outer edge of the flange of the lower section ofthe fire pot and the base, said space between the upper section of thefire pot and the upper curved band forming a chamber around the fire potthrough which the draft passes, a part of the heated air passing upthrough said ports in the flange in the upper section of the fire potwhile a part of the heated air passes down through the semicircularopening in the flange on the lower section of the fire pot and thencethrough a similar opening in the top of the rear of the base into saidbase and up through the grate, a draft tube formed by a projection ofsaid upper band, a lower section of the combustion chamber wall seatedin the top groove in the flange in said upper section of the fire pot, abaffle plate integral with the inside of said section of combustionchamber wall, a cap forming a fire pot dome and a radiator havingconnection with said dome through which radiator heat from thecombustion chamber passes, substantially as described and shown.

2. The combination in a hot air furnace of a base having a grate and anash pit provided with a semi-circular opening rear ward of the grate, alower fire pot section supported by said base having a semi-circularopening and an outwardly extending flange at the top thereof said flangebeing provided with an upper and lower groove upon the periphery of theupper and lower faces thereof and a groove at the upper, inner edgethereof, an upper fire pot sect-ion seated in said upper inner groovehaving an outwardly extending flange at the top thereof said flange alsobeing provided with an upper and lower groove upon the periphery of theupper and lower faces thereof, a supporting member seated on said baseengaging with the lower groove upon the periphery of the lower face ofthe lower fire pot section flange, a curved band spaced from the upperfire pot section seated in the groove on the upper face of saidperiphery of the flange of said lower fire pot section and engaging withthe groove on the lower face of the upper section fire pot flangeperiphery, a lower section of the combustion chamber wall supported inthe groove on the upper face of said upper fire pot section flangeperiphery and provided with a supporting groove cast integral on theoutside thereof, an upper section of combustion chamber wall seated insaid supporting groove, a baffle plate rigid with the lower part of thecombustion chamber wall, a draft tube formed by a projection of saidcurved band a draft door at the front end of said tube and means forcarrying off the products of combustion, substantially as shown and setforth.

3. A hot air furnace comprising the necessary draft and smoke inlets andoutlets, a base, a fire pot consisting of upper and lower sections theupper section being provided with an outward flange having a groove inthe upper face of its periphery, a lower section of rear combustionchamber wall seated in said groove said section of wall having asupporting groove integral therewith upon its outer surface, an uppersect-ion of combustion chamber wall seated in said groove on the lowersection of wall and a bafiie plate carried on the top edge of the lowersection of the combustion chamber wall, substantially as shown and setforth.

4. In a hot air furnace having the necessary draft inlets and outletsthe combination with a base therefor, a fire pot provided at the topwith an outward flange having a groove on the upper face of itsperiphery, a grate at the base of said fire pot, a radiator and the capthereof, of a section of the combustion chamber wall seated in saidgroove and provided with a horizontal groove on its rear surface, anupper section of combustion chamber wall seated in said horizontalgroove and extending upward and forward into In testimony whereof Iafiix my signature connection with said radiator and a baffle inpresence of two witnesses.

plate carried on the top edge of the section of combustion chamber wallhaving said LINCOLN HOWARD groove on its rear surface, said baffle plateWitnesses: bearing upwardly and forwardly over said O. S. PAYNE, firepot substantially as described. I T. O. HAWKINS.

